Tenda AC9 User Manual page 95

Configuration
Log in to the Router's User Interface, and click Advanced Settings > Virtual Server.
❶
Type the IP address of the computer that established the FTP server (192.168.0.105 here).
❷
Select the FTP server default port (21), the extranet port will be auto-filled. If you select Manual,
you need to enter the extranet port manually, too.

Select a protocol. If you don't know which protocol the server use, you can select TCP/UDP.
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Specify Advanced Settings
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